*** Use Minitab to obtain a square root matrix of a positive definite mtx.

 MTB > read 2 2 m1
 DATA> 2 1
 DATA> 1 6
       2 rows read.
 MTB > eigen m1 c1 m2
 MTB > print c1
 
 C1      
   6.23607   1.76393 
 
 MTB > let c2=sqrt(c1)
 MTB > diagonal c2 m3
 MTB > print m3
 
  Matrix M3
  
  2.497212  0.000000 
  0.000000  1.328131 
 
 MTB > multi m2 m3 m4
 MTB > trans m2 m5
 MTB > multi m4 m5 m6
 MTB > print m6
 
  Matrix M6
  
   1.38984   0.26141 
   0.26141   2.43550 
 
 MTB > multi m6 m6 m7    <==== Double check the result
 MTB > print m7
 
  Matrix M7
  
   2   1 
   1   6 
 MTB > stop